DC

This page lists questions and answers that were posted by visitors named DC.

Questions

The following questions were asked by visitors named DC.

A mineral sample is analyzed for its cobalt and calcium content. A sample is dissolved, and then the cobalt and calcium are precipitated as Co(OH)2(s) and Ca(OH)2(s). At what pH can Co(OH)2(s) be separated from Ca(OH)2(s) at 25 °C? Assume that an effectiv...

I would really appreciate some help with this thermochemistry problem! I'm really confused as to why I keep getting the wrong answers... I have gotten w=-1.305kj and energy change = 78.13kj... both of which were marked wrong. Here's the question: The oxid...

help - confusion :( The oxidation of copper(I) oxide, Cu2O(s), to copper(II) oxide, CuO(s), is an exothermic process, 2 Cu2O + O2 --> 4CuO The change in enthalpy upon reaction of 75.30 g of Cu2O(s) is -76.83 kJ. Calculate the work, w, and energy change, Δ...

If Dave is 6 feet tall and casts a shadow of 15 feet, what is the height of a tree that casts a shadow of 81 feet? Draw a diagram and solve for the height of the tree.

The entire second grade at Sunshine Elementary participated in a single elimination checkers tournament. There are a total of 118 second graders and so there were 59 matches in the first round of the tournament. In the second round,the 59 remaining studen...

two cars are approaching each other on the same highway one from san bernardino at 80 mph and the other from las vegas at 60 mph how far apart are they on the highway one hour before they meet?

Tasha’s school bus usually drops her off in town every day at 4pm and her mother picks her up at the bus stop. Last Friday was a short school day, only Tasha’s mother forgot so she wasn’t at the bus stop when Tasha was dropped off an hour early, at 3pm. S...

In a grand prix automobile race, Speedy Ryder averaged 110 miles per hour for the first half of the course and 130 miles per hour for the second half of the course. Cannonball Carter maintained a constant speed of 120 miles per hour throughout the race. W...

carmen is a girl scout camp counselor and needs to assign scouts to tents. She noticed that if two scouts were assigned to each tent then six girls would have no tent. On the other hand, if four scouts were assigned to each tent then there will be three e...

1/4 pages typed per minute how many pages can be typed in 18minutes

Multiply. write each product in simplest form. 3 7/10 X 7

The projection of a line on axes are 6,2,3. What will the direction cosines of the lines be?

ADDITION OF FRACTIONS WITH UNLIKE DENOMINATORS HELP!!! 7 QUESTIONS I NEED ANSWERS 6GRADE

Alex and Carlos drop an object into the flour from the same height of 1.6 meters. The depth of the holes is recorded in the table above. Which of the following is the best explanation for the difference? (Lesson 3) a. Alex’s object has a smaller width b....

Answers

The following answers were posted by visitors named DC.

5 ways : Water and sanition , Population

Thank you so much for your response. Just to be clear are you saying I need to multiply .8176 x 80 and then .7977 x 80?

You're awesome, thank you much and Happy Holidays to you!

You're awesome, thank you much and Happy Holidays to you!

Thank you Ms. Sue - Happy Holidays to you!

These are the given Ksp values to use: Ksp of Co(OH)2 is 5.9x10^-15 M^3 Ksp of Ca(OH)2 is 5.0x10^-6 M^3

Thanks Dr.Bob!! I was then able to plug into the second equation and found the concentration of calcium! You were great help! Thanks again :)

ok I recalculated and got the w=.006523kJ and the energy change to be -76.82kJ... The energy change is right but the w is wrong for some reason... I calculated w as w=-delta(n)RT = -(0-.26312molO2)(8.314452x10^-2 Lbarr/molK)(25+273.15) = 6.5226J=.006523kJ...

Here, P=Q-1 Now, P-Q = Q-1 - Q = -1 Therefore, P-Q=-1

ITS NOT ABCB YOU WILL GET A 2 OUT OF 4

bob is wrong i will get 1 out of 4

lies i got a 3/5

Mrbeast ur wrong I get A's for using this

b you are wrong

i need the answers to the 7 questions

UNIT 6 LESSON 3

this app is for help plus this doesn't count for a grade

PLSS SOMEONE HELPPP

i got the answers its ACBACCB

joen junkbook is wrong u will get 0/4

james hes wrong.

IDK MY NAME IS WRONG!!!! I GOT 0/5!!!! IDK MY NAME IS WRONGGGG

IDKU PEOPLE yes u are late very laye

XD IS SO WRONG I GOT 3 OUT OF 5 XD IS LYING

ORANGE U ARE RIGHT TYSM MY DA/MOM WOULD HAT EME IF I FAIL TYSM I COULD OF DIED TY

jakey is wrong I got a 0 jakey stop lieing

I I multiplied 50 by 3 & got 150, 3.1 to 155, 3.12 to 156, & 3.125 to 156.2550 by 3 & got 150, 3.1 to 155, 3.12 to 156, & 3.125 to 156.25

DON'T C&P ANYONE ANSWERS U WILL GET CAUGHT!!